Spontaneous?

[Valeria Viera 1B]

How do you know if delta S, H, or G are spontaneous?

[Jaqueline Monreal 2L]

they are usually spontaneous if they're values are negative, meaning they are releasing energy

[Dhwani Krishnan 1G]

Enthalpy doesn't really show spontaneity, except that exothermic reactions are generally spontaneous because delta S is usually positive for these reactions.

A positive entropy generally indicates a spontaneous process, but only with a negative delta G can you be sure.

[Ariel Cheng 2I]

I think the only way to be sure of spontaneity is when ΔG is negative (when ΔH −TΔS is negative) though I could be wrong.

[Sheridan Slaterbeck 1J]

It is spontaneous if delta G is negative, if (-TdeltaS) is negative, if deltaS is positive, and if delta H is negative
delta G = deltaH -TdeltaS

[Sheridan Slaterbeck 1J]

When delta G is negative it is exergonic and when it is positive it is endergonic
when delta H is negative it is exothermic and when it is positive it is endothermic.

[505211599]

You can only know for sure if a process is spontaneous if delta G is negative.

[Mariana Fuentes 1L]

if delta s is positive the process will be spontaneous.
if delta g is negative then it is exergonic meaning that it is spontaneous in the forward direction.
if delta g is greater than 0 it is spontaneous in the reverse direction.
delta h <0 and delta s>0 spontaneous
delta h<0 and delta s spontaneous if temperature is low

[Jacob Bershatski 4C]

Enthalpy cannot be used to determine spontaneity. By definition, a negative deltaG means a reaction is spontaneous. A positive deltaS I assume would also be considered spontaneous in most cases according to the Second Law of Thermodynamics.

[Aiden Atoori 1C]

You can determine if it’s spontaneous depending on whether delta G is negativeness or not.

[isarose0]

if delta G is negative, the reaction is spontaneous, if delta G is positive it is nonspontaneous

[AnnaYan_1l]

When delta G is negative, it is spontaneous

[Jack DeLeon 1B]

with a negative deltaG, it indicates that the second state of the reaction, in other words the products, are favored so therefore the reaction is spontaneous

[Rehan Chinoy 1K]

I think there is some general confusion about what spontaneity is. "Spontaneous" describes a process or reaction, so values of delta H, G, or S themselves cannot be spontaneous, but they can be used to prove spontaneity through the equation Delta G = Delta H - Temp(Delta S). The process is spontaneous when Delta G is negative.